Not appropriate for at all. Seriously. The research is against this.
http://www.edweek.org/ew/articles/2012/07/03/36boaler.h31.html
From the article:
"In Beilock’s recent research conducted with children in 1st and 2nd grade, she found that levels of math anxiety did not correlate with grade level, reading level, or parental income. For the most capable students, the research confirms, stress impedes the functioning of their working memory and reduces achievement. Research conducted at Stanford revealed that math anxiety changes the structure and workings of the brain."